They haven't lost 744,408 coins, that is the total they had on an exchange, they do have a deficit of about 200,000 coins. It is bad, but it could have been a lot worse.
I hate to reply duplicated thread but clearification must immediately follow misinformation. They indeeded lost 744k coins, the '200,000' is the life-saving coins they are asking from investors to get back on their business, if the information of insolvency was remain closed to the public and they resume operation - the other 540k coins they can get slowly in the years following.
Quote: " At this point 744,408 BTC are missing due to malleability-related theft which went unnoticed for several years."